CN117943893A - Method and device for measuring thermal elongation of main shaft rotating cutter - Google Patents
Method and device for measuring thermal elongation of main shaft rotating cutter Download PDFInfo
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Abstract
The application provides a method and a device for measuring the thermal elongation of a main shaft rotating tool, which are characterized in that the thermal elongation measurement of the main shaft rotating tool is started to obtain historical temperature data and historical thermal elongation measurement data of the target main shaft rotating tool, a plurality of temperature control decision domains of the target main shaft rotating tool are determined according to the historical temperature data, a plurality of tool thermal hysteresis coefficients are further determined according to the historical thermal elongation measurement data, all the tool thermal hysteresis coefficients are converted into thermal hysteresis sequences, a tool thermal sensitivity matrix is determined according to the thermal hysteresis sequences and all the temperature control decision domains, the thermal elongation approaching amount of the target main shaft rotating tool at the current moment is determined according to the tool thermal sensitivity matrix, and then the measurement is re-performed after the measurement equipment of the target main shaft rotating tool is calibrated according to the thermal elongation approaching amount, so that the influence of the thermal elongation change of the main shaft rotating tool due to the environmental temperature is reduced.
Description
Technical Field
The application relates to the technical field of spindle rotating cutters, in particular to a spindle rotating cutter thermal elongation measuring method and a measuring device.
Background
The basic principle of the machining device generally applied to a machine tool relates to the mutual matching of the spindle of the machine tool and the tool, so that the tool can perform operations such as cutting, milling, drilling and the like under the driving of the rotating spindle, the rotating speed and the rotating direction of the spindle are generally and accurately regulated and controlled by a control system of the machine tool, the tool is a tool fixed on the spindle and used for cutting a workpiece, and the spindle rotating tool plays an important role in manufacturing high-precision parts and completing various machining tasks and becomes an integral part in modern engineering and manufacturing.
The measurement of the thermal elongation of a main shaft rotating tool is an important technology in the field of machining, aims to accurately measure the dimensional changes of the main shaft and the tool caused by temperature changes in the running process of a high-precision machine tool, has higher precision requirements on product processing, needs to measure the thermal elongation of the main shaft rotating tool in real time,
Because heat generated in the processing process is dissipated into the measuring environment of the measuring equipment of the spindle rotating tool, the measured ambient temperature is increased along with the increase of the heat, and the thermal elongation measurement is carried out under the condition that the ambient temperature is gradually increased, the thermal elongation error of the spindle rotating tool is often caused to be larger, so that the problem that the thermal elongation change of the spindle rotating tool is influenced by the ambient temperature becomes a research hot spot in the process of carrying out the thermal elongation measurement of the spindle rotating tool is avoided.
Disclosure of Invention
Accordingly, in view of the above-mentioned problems, the present application provides a method and apparatus for measuring thermal elongation of a spindle rotating tool, which are used for reducing the influence of environmental temperature on the thermal elongation change of the spindle rotating tool.
In order to solve the technical problems, the application adopts the following technical scheme:
In a first aspect, the present application provides a method for measuring thermal elongation of a spindle rotating tool, comprising:
Starting the thermal elongation measurement of the main shaft rotating tool to obtain historical temperature data and historical thermal elongation measurement data of the target main shaft rotating tool;
determining a plurality of temperature control decision domains of the target spindle rotating tool according to the historical temperature data;
determining a plurality of cutter thermal hysteresis coefficients according to the historical thermal elongation measurement data, and converting all the cutter thermal hysteresis coefficients into a thermal hysteresis sequence;
Determining a cutter heat sensitivity matrix by the thermal hysteresis sequence and all temperature control decision domains, and further determining the thermal elongation approaching amount of the target spindle rotating cutter at the current moment by the cutter heat sensitivity matrix;
and calibrating the measuring equipment of the target spindle rotating tool through the thermal elongation approach quantity, and then re-measuring.
In some embodiments, determining the plurality of temperature control decision domains of the target spindle rotating tool from the historical temperature data specifically includes:
Determining each temperature control coupling degree of the spindle rotating tool according to the historical temperature data;
and determining a plurality of temperature control decision domains of the target spindle rotating tool through a preset temperature control decision value and all the temperature control coupling degrees.
In some embodiments, determining each temperature-controlled degree of coupling of the spindle rotating tool based on the historical temperature data specifically includes:
Determining a plurality of temperature measurement dispersion sequences according to the historical temperature data;
And determining the respective temperature control coupling degree of the spindle rotating tool through all the temperature measurement dispersion sequences.
In some embodiments, determining a plurality of tool thermal hysteresis coefficients from the historical thermal elongation measurement data specifically includes:
Determining a tool thermal elongation mean square sequence according to the historical thermal elongation measurement data;
acquiring all temperature measurement dispersion sequences;
And determining a plurality of cutter thermal hysteresis coefficients according to all the temperature measurement dispersion sequences and the cutter thermal elongation mean square sequences.
In some embodiments, determining the tool thermal sensitivity matrix from the thermal hysteresis sequence and all temperature control decision domains specifically includes:
selecting a temperature control decision domain;
Determining a cutter heat sensitivity sequence of the temperature control decision domain according to the thermal hysteresis sequence;
repeating the steps to determine a cutter heat sensitivity sequence of the residual temperature control decision domain;
acquiring a thermal elongation mean square sequence of the cutter;
And forming a cutter heat-sensitive matrix by all the cutter heat-sensitive sequences and the cutter heat-extension mean square sequences.
In some embodiments, determining the thermal extension approach amount of the target spindle rotating tool at the current time by the tool thermal sensitivity matrix specifically includes:
Carrying out time-varying offset serialization on the cutter heat-sensitive matrix to obtain a cutter heat-sensitive time-varying characteristic sequence;
determining a cutter time-varying thermal response factor according to the cutter heat-varying time-varying characteristic sequence;
And determining the thermal extension approaching amount of the spindle rotating tool at the current moment according to the thermal-sensitive time-varying characteristic sequence of the tool and the thermal-sensitive time-varying response factor of the tool.
In some embodiments, performing time-varying offset serialization on the tool heat-sensitive matrix to obtain a tool heat-sensitive time-varying feature sequence specifically includes:
determining a time-varying offset time window sequence according to the cutter heat sensitivity matrix;
And determining a cutter thermosensitive time-varying characteristic sequence for the cutter thermosensitive matrix according to the time-varying offset time window sequence.
In a second aspect, the present application provides a spindle rotary tool thermal elongation measuring device, comprising:
the acquisition module is used for starting the thermal elongation measurement of the main shaft rotating tool and acquiring the historical temperature data and the historical thermal elongation measurement data of the target main shaft rotating tool;
The processing module is used for determining a plurality of temperature control decision domains of the target spindle rotating tool according to the historical temperature data;
The processing module is further used for determining a plurality of cutter thermal hysteresis coefficients according to the historical thermal elongation measurement data and converting all the cutter thermal hysteresis coefficients into a thermal hysteresis sequence;
The processing module is also used for determining a cutter heat sensitivity matrix according to the thermal hysteresis sequence and all temperature control decision domains, and further determining the thermal extension approaching amount of the target spindle rotating cutter at the current moment according to the cutter heat sensitivity matrix;
and the execution module is used for carrying out measurement again after calibrating the measurement equipment of the target spindle rotating tool through the thermal extension approach quantity.
In a third aspect, the present application provides a computer apparatus comprising a memory storing code and a processor configured to obtain the code and to perform the spindle rotation tool thermal elongation measurement method described above.
In a fourth aspect, the present application provides a computer readable storage medium storing a computer program which when executed by a processor implements the spindle rotating tool thermal elongation measurement method described above.
The technical scheme provided by the embodiment of the application has the following beneficial effects:
According to the method and the device for measuring the thermal elongation of the main shaft rotating tool, a plurality of temperature control decision domains of the target main shaft rotating tool are determined according to the historical temperature data, and the temperature control decision domains represent the influence degree of the environmental temperatures of different temperature measuring points of the main shaft rotating tool on the thermal elongation of the main shaft rotating tool; in addition, a thermal hysteresis sequence is determined according to the historical thermal elongation measurement data, and the thermal hysteresis sequence can reflect the reaction speed of a key temperature measurement point to the thermal elongation under the influence of the ambient temperature; further, the thermal elongation of the main shaft rotating tool at the current moment is corrected through all temperature control decision domains and the thermal hysteresis sequences, and the corrected thermal elongation is used as the thermal elongation approaching amount of the main shaft rotating tool at the current moment; finally, the thermal elongation approaching amount is used for calibrating the measuring equipment of the main shaft rotating tool, and then the thermal elongation of the main shaft rotating tool is measured again, so that the influence of the environmental temperature on the thermal elongation change of the main shaft rotating tool is reduced.
Drawings
FIG. 1 is an exemplary flow chart of a spindle rotating tool thermal elongation measurement method according to some embodiments of the present application;
FIG. 2 is a schematic diagram illustrating an exemplary flow for determining a temperature control decision domain according to some embodiments of the application;
FIG. 3 is a schematic diagram illustrating an exemplary process for determining thermal hysteresis coefficients of a plurality of tools according to some embodiments of the application;
FIG. 4 is a schematic diagram of exemplary hardware and/or software of a spindle rotating tool thermal elongation measurement device according to some embodiments of the present application;
fig. 5 is a schematic structural view of a computer apparatus for implementing a spindle rotation tool thermal elongation measurement method according to some embodiments of the present application.
Detailed Description
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments. Referring to fig. 1, which is an exemplary flowchart of a spindle rotary tool thermal elongation measurement method according to some embodiments of the present application, the spindle rotary tool thermal elongation measurement method 100 mainly includes the steps of:
In step 101, a spindle rotating tool thermal elongation measurement is initiated to obtain historical temperature data and historical thermal elongation measurement data for a target spindle rotating tool.
In particular, after the spindle rotating tool thermal elongation measurement is started, historical temperature data and historical thermal elongation measurement data of the spindle rotating tool can be obtained from a database of the target spindle rotating tool measuring device.
In the present application, the historical temperature data is data composed of temperature values of a plurality of temperature measurement points, wherein the temperature measurement points are acquisition points of temperatures around the spindle rotating tool, the historical thermal elongation measurement data is data composed of variation of deformation of the spindle rotating tool due to temperature rise expansion, and the thermal elongation of the spindle rotating tool and the temperatures of the temperature measurement points are acquired 1 time every 1 minute.
In step 102, a plurality of temperature control decision domains of the target spindle rotating tool are determined according to the historical temperature data.
In some embodiments, referring to fig. 2, which is a schematic flow chart of determining a temperature control decision domain according to some embodiments of the present application, the determining the temperature control decision domain in this embodiment may be implemented by the following steps:
in step 1021, determining each temperature control coupling degree of the spindle rotating tool according to the historical temperature data;
Then, in step 1022, a plurality of temperature control decision domains of the target spindle rotating tool are determined through the preset temperature control decision values and all the temperature control coupling degrees.
Wherein, in some embodiments, determining each temperature control coupling degree of the spindle rotating tool according to the historical temperature data can be realized by the following steps:
Determining a plurality of temperature measurement dispersion sequences according to the historical temperature data;
And determining the respective temperature control coupling degree of the spindle rotating tool through all the temperature measurement dispersion sequences.
In specific implementation, a plurality of temperature measurement dispersion sequences are determined according to the historical temperature data, namely: selecting one temperature measuring point of the spindle rotating tool in the historical temperature data, carrying out deviation standardization on all temperatures of the temperature measuring points, taking values obtained by the deviation standardization of each temperature as deviation temperature values, sequencing all the deviation temperature values according to the sequence of corresponding temperature acquisition time, taking a sequence obtained by sequencing as a temperature measuring deviation sequence of the temperature measuring point, and repeating the steps to obtain the temperature measuring deviation sequence of the rest temperature measuring points.
In some embodiments, the respective temperature-controlled coupling degree of the spindle rotating tool determined according to all the temperature measurement dispersion sequences can be determined by adopting the following formula:
Wherein, Represents the first/>, of the spindle rotating toolDegree of coupling of temperature control,/>Represents the/>No./>, in the temperature measurement dispersion sequence of each temperature measurement pointThe value of the dispersion temperature of each of the two,/(I)First/>No./>, in the temperature measurement dispersion sequence of each temperature measurement pointIndividual dispersion temperature values,/>Represents the/>Maximum dispersion temperature value in the temperature measurement dispersion sequence of each temperature measurement point,/>Represents the/>Minimum dispersion temperature value in temperature measurement dispersion sequence of each temperature measurement point,/>Representing the total number of discrete temperature values in the temperature measurement discrete sequence,/>The total number of temperature measurement points of the spindle rotating tool is indicated.
In the application, one temperature control coupling degree corresponds to one temperature measurement point, in addition, the larger the temperature control coupling degree is, the stronger the coupling between different temperature measurement points is determined according to the preset temperature control decision value and all the temperature control coupling degrees, the stronger the temperature measurement points with strong coupling can be classified as one type, and the temperature measurement points with weak coupling are classified as the other type.
In specific implementation, a plurality of temperature control decision domains of the target spindle rotating tool are determined through a preset temperature control decision value and all temperature control coupling degrees, namely: and selecting one temperature measurement point of the main shaft rotating tool, if the sum of the temperature control coupling degree corresponding to the other temperature measurement point and the temperature control coupling degree corresponding to the temperature measurement point is larger than a preset temperature control decision value, dividing the two temperature measurement points into the same type, taking the temperature measurement point of the same type as a temperature control decision domain of the target main shaft rotating tool, and repeating the steps to obtain the rest temperature control decision domain of the target main shaft rotating tool.
It should be noted that, in the present application, the divided temperature measurement points are not selected in the next selection, when the divided temperature measurement points remain undivided temperature measurement points are used as abnormal temperature measurement points, the temperature control decision domain is not divided, the temperature control decision value can be preset according to the historical temperature control coupling degree, and the value obtained by multiplying the average value of the historical temperature control coupling degree by 2 is used as the temperature control decision value.
In step 103, a plurality of tool thermal hysteresis coefficients are determined from the historical thermal elongation measurement data, and all tool thermal hysteresis coefficients are converted into a thermal hysteresis sequence.
In some embodiments, referring to fig. 3, which is a schematic flow chart of determining thermal hysteresis coefficients of a plurality of tools according to some embodiments of the present application, the thermal hysteresis coefficients of the plurality of tools may be implemented by the following steps:
in step 1031, determining a tool thermal elongation mean square sequence from the historical thermal elongation measurement data;
Next, in step 1032, all of the thermometry dispersion sequences are acquired;
then, in step 1033, a plurality of tool thermal hysteresis coefficients are determined from all temperature measurement dispersion sequences and the tool thermal elongation mean square sequences.
And in concrete implementation, determining a cutter thermal elongation mean square sequence according to the historical thermal elongation measurement data, namely: calculating an average value and a standard deviation for all the thermal elongations of the spindle rotating tool in the historical thermal elongation measurement data respectively, taking the obtained average value as a thermal elongation average value, taking the obtained standard deviation as a thermal elongation standard deviation, selecting one of the thermal elongations, subtracting the thermal elongation average value from the one thermal elongation, dividing the thermal elongation by the square of the thermal elongation standard deviation, and taking the obtained value as the mean square thermal elongation of the thermal elongation, for example: mean square thermal elongation，/>Represent the mean value of thermal elongation,/>Standard deviation of thermal elongation,/>And (3) representing the thermal elongation, repeating the steps to obtain the mean square thermal elongation of the residual thermal elongation, sequencing all the mean square thermal elongation according to the sequence of the corresponding thermal elongation acquisition, and taking the sequence obtained by sequencing as a cutter thermal elongation mean square sequence.
Wherein, in some embodiments, determining a plurality of tool thermal hysteresis coefficients from all temperature measurement dispersion sequences and the tool thermal elongation mean square sequences can be achieved by:
Acquiring the first No./>, in individual temperature measurement dispersion sequencesIndividual dispersion temperature values/>；
Obtaining the first time in the thermal elongation mean square sequence of the cutterIndividual mean square thermal elongation/>；
Obtaining the thermal elongation resolution factor of the thermal elongation mean square sequence of the cutter；
According to the firstNo./>, in individual temperature measurement dispersion sequencesIndividual dispersion temperature values/>The/>, in the tool thermal elongation mean square sequenceIndividual mean square thermal elongation/>Thermal elongation resolution factor/>, of the tool thermal elongation mean square sequenceDetermining a plurality of tool thermal hysteresis coefficients, whereinThe thermal hysteresis coefficients of the individual tools can be determined using the following formula:
Wherein, Represents the/>Thermal hysteresis coefficient of each cutter,/>The total number of discrete temperature values in the temperature measurement discrete sequence is represented.
It should be noted that, in the present application, a thermal hysteresis coefficient of a tool corresponds to a temperature measurement point, the thermal hysteresis coefficient of the tool represents a reaction speed of the temperature measurement point of the spindle rotating tool to the thermal elongation under the influence of the ambient temperature, the greater the thermal hysteresis coefficient of the tool, the faster the reaction speed of the temperature measurement point of the spindle rotating tool to the thermal elongation, in addition, the thermal elongation resolution factor reflects the accuracy of the thermal hysteresis coefficient of the tool to the reaction speed between the mean square thermal elongation and the deviation temperature value, the range of the value is between 0 and 1, and the thermal elongation resolution factor of the present application takes a value of 0.6.
In specific implementation, all the thermal hysteresis coefficients of the cutter are converted into a thermal hysteresis sequence, namely: and (3) sequencing all the thermal hysteresis coefficients of the cutters in a descending order, and taking the sequence sequenced in the descending order as a thermal hysteresis sequence.
In step 104, a tool heat sensitivity matrix is determined by the thermal hysteresis sequence and all temperature control decision domains, and then the thermal extension approaching amount of the target spindle rotating tool at the current moment is determined by the tool heat sensitivity matrix.
In some embodiments, determining the tool thermal sensitivity matrix from the thermal hysteresis sequence and all temperature control decision domains may be accomplished by:
selecting a temperature control decision domain;
Determining a cutter heat sensitivity sequence of the temperature control decision domain according to the thermal hysteresis sequence;
repeating the steps to determine a cutter heat sensitivity sequence of the residual temperature control decision domain;
acquiring a thermal elongation mean square sequence of the cutter;
And forming a cutter heat-sensitive matrix by all the cutter heat-sensitive sequences and the cutter heat-extension mean square sequences.
In specific implementation, the cutter heat sensitivity sequence of the temperature control decision domain is determined according to the heat hysteresis sequence, namely: for all temperature measurement points in the temperature control decision domain, screening out a temperature measurement point corresponding to the maximum thermal hysteresis coefficient in the thermal hysteresis sequence, and taking a temperature measurement deviation sequence corresponding to the temperature measurement point as a cutter heat sensitivity sequence of the temperature control decision domain; all the cutter heat-sensitive sequences and the cutter heat-extension mean square sequences form a cutter heat-sensitive matrix, namely: combining all the cutter heat-sensitive sequences and the cutter heat-elongation mean square sequences in sequence to obtain a cutter heat-sensitive matrix, for example: and S1, S2 and S3 are cutter heat sensitivity sequences, S4 is cutter heat elongation mean square sequence, and the cutter heat sensitivity matrix S= [ S1, S2, S3 and S4].
In the application, the cutter heat-sensitive matrix is a matrix formed by all cutter heat-sensitive sequences and cutter heat-extension mean square sequences in a time sequence, namely, the row of the cutter heat-sensitive matrix corresponds to the moment, wherein the moment takes 1 minute as a time interval, one row of data of the cutter heat-sensitive matrix is taken as heat-sensitive extension data, the heat-sensitive extension data represents data formed by the temperature and the mean square heat extension of a plurality of screened temperature measuring points at the current moment, and the columns of the cutter heat-sensitive matrix respectively correspond to the cutter heat-sensitive sequences and the cutter heat-extension mean square sequences.
In some embodiments, determining the thermal extension approaching amount of the target spindle rotating tool at the current moment through the tool thermal sensitivity matrix can be achieved by the following steps:
Carrying out time-varying offset serialization on the cutter heat-sensitive matrix to obtain a cutter heat-sensitive time-varying characteristic sequence;
determining a cutter time-varying thermal response factor according to the cutter heat-varying time-varying characteristic sequence;
And determining the thermal extension approaching amount of the spindle rotating tool at the current moment according to the thermal-sensitive time-varying characteristic sequence of the tool and the thermal-sensitive time-varying response factor of the tool.
In some embodiments, the time-varying offset serialization is performed on the tool heat-sensitive matrix, and the obtained tool heat-sensitive time-varying feature sequence may be implemented by the following steps:
determining a time-varying offset time window sequence according to the cutter heat sensitivity matrix;
And determining a cutter thermosensitive time-varying characteristic sequence for the cutter thermosensitive matrix according to the time-varying offset time window sequence.
In specific implementation, a time-varying offset time window sequence is determined according to the cutter heat sensitivity matrix, namely: starting from the 1 st row in the cutter heat-sensitive matrix, selecting W rows of heat-sensitive elongation data, taking the obtained data as a first time-varying offset time window, starting from the 2 nd row in the cutter heat-sensitive matrix, selecting W rows of heat-sensitive elongation data, taking the obtained data as a second time-varying offset time window, and so on to obtain an ordered time-varying offset time window set, taking the ordered time-varying offset time window set as a time-varying offset time window sequence, wherein the value of W is 50, and other methods can be adopted for setting in other embodiments, and the method is not limited.
Wherein, in some embodiments, determining a tool thermosensitive time-varying feature sequence for the tool thermosensitive matrix from the time-varying offset time window sequence may be implemented by:
selecting a first time-varying offset time window in the time-varying offset time window sequence;
Performing offset regression fitting on the time-varying offset time windows to obtain offset regression vectors of the time-varying offset time windows;
determining a time-varying offset characteristic value of a first time-varying offset time window according to the offset regression vector;
Repeating the steps, selecting a second time-varying offset time window in the time-varying offset time window sequence, determining a time-varying offset characteristic value of the second time-varying offset time window, and analogically, determining the time-varying offset characteristic value of the remaining time-varying offset time windows in the time-varying offset time window sequence;
And forming a sequence from all the time-varying offset characteristic values according to the time sequence obtained in sequence, and taking the obtained sequence as a thermosensitive time-varying characteristic sequence of the cutter.
In specific implementation, performing offset regression fitting on the time-varying offset time window to obtain an offset regression vector of the time-varying offset time window, namely: and performing regression fitting on all heat-sensitive elongation data in the time-varying offset time window by using a multiple linear regression model in MATLAB, and taking the weight obtained by fitting as an offset regression vector.
In a specific implementation, a time-varying offset characteristic value of the time-varying offset time window is determined according to the offset regression vector, namely: and loading an offset regression vector obtained by regression fitting of the time-varying offset time window by using MATLAB, overlapping the time-varying offset time window with the position corresponding to the cutter heat sensitive matrix, taking the next row of heat sensitive elongation data overlapped with the cutter heat sensitive matrix of the time-varying offset time window as input data, and taking the calculated value as a time-varying offset characteristic value of the time-varying offset time window through MATLAB operation.
In the application, the time-varying offset serialization is used for capturing the short-term trend or the long-term trend of the thermal elongation of the spindle rotating tool, and mainly depends on the time-varying offset time window length, and when the time-varying offset time window length is larger, the time-varying offset serialization captures the long-term trend of the thermal elongation of the spindle rotating tool.
In addition, the thermosensitive time-varying characteristic sequence of the tool is a sequence formed by a plurality of time-varying offset characteristic values, wherein different time-varying offset characteristic values represent predicted values of the thermal elongation of the spindle rotating tool at different moments.
Wherein in some embodiments, determining the tool time-varying thermal response factor from the tool time-varying thermal time-varying feature sequence specifically comprises:
Acquiring the first time-varying characteristic sequence of the cutter Time-varying offset eigenvalues/>；
Obtaining the first time in the mean square sequence of the thermal extension of the cutterIndividual mean square thermal elongation/>；
Acquiring the length of a time-varying offset time window；
Obtaining the total number of time-varying offset characteristic values in the thermosensitive time-varying characteristic sequence of the cutter；
According to the first time-varying characteristic sequence of the cutterTime-varying offset eigenvalues/>/>, In the tool thermal elongation mean square sequenceIndividual mean square thermal elongation/>Length of time-varying offset time window/>And the total number/>, of time-varying offset characteristic values in the tool thermosensitive time-varying characteristic sequenceDetermining a tool time-varying thermal response factor, wherein the tool time-varying thermal response factor can be determined using the following equation:
Wherein, Representing the tool time-varying thermal response factor,/>Representing the/>, in the thermosensitive time-varying characteristic sequence of the cutterTime-varying offset eigenvalues,/>Representing the/>, in the tool thermal elongation mean square sequenceHeat elongation in mean square,/>Representing the length of a time-varying offset time window,/>And the total number of time-varying offset characteristic values in the thermosensitive time-varying characteristic sequence of the cutter is represented.
In the present application, the time-varying thermal response factor indicates a degree of feedback for predicting the thermal elongation of the spindle rotating tool, and a smaller degree of feedback indicates that the prediction of the thermal elongation of the spindle rotating tool is more accurate, and the accuracy of the prediction of the thermal elongation can be improved by increasing or decreasing the time-varying offset time window length.
In some embodiments, determining the thermal extension approach amount of the spindle rotating tool at the current moment according to the tool thermosensitive time-varying feature sequence and the tool time-varying thermal response factor can be achieved by the following steps:
acquiring the tool time-varying thermal response factor ；
Acquiring the previous time of the heat-sensitive time-varying characteristic sequence of the cutter at the current timeTime-varying offset eigenvalues/>；
Acquiring the rotation cutter of the main shaftThermal elongation approach amount at time/>；
According to the tool time-varying thermal response factorAcquiring the previous/>, at the current moment, of the thermosensitive time-varying characteristic sequence of the cutterTime-varying offset eigenvalues/>The main shaft rotates the cutter at/>Thermal elongation approach amount at time/>Determining the thermal elongation approaching amount of the shaft rotating cutter at the current moment, wherein the thermal elongation approaching amount can be determined by adopting the following formula:
Wherein, Indicating that the main shaft rotates the cutter at the current moment/>Approach to thermal elongation of,/>Representing the current moment/>Before,/>Representing the length of the time-varying offset time window.
In concrete implementation, the main shaft rotating cutter is arranged onThe thermal elongation approaching amount at the moment can be determined by the following steps: taking a time-varying offset characteristic value at the 1 st moment in the thermosensitive time-varying characteristic sequence of the rotating tool as the thermal extension approaching amount of the spindle rotating tool at the 1 st moment, substituting the thermal extension approaching amount of the spindle rotating tool at the 1 st moment into the formula for determining the thermal extension approaching amount, and iterating until the time reaches/>At the moment, the main shaft rotating cutter is obtainedThermal elongation approach amount at time.
In the present application, the thermal expansion approaching amount means a correction of a result of predicting the thermal expansion of the spindle rotating tool, and the accuracy of the thermal expansion prediction of the spindle rotating tool can be improved by the correction.
In step 105, the measurement is re-performed after calibrating the measurement device of the target spindle rotating tool by the thermal elongation approach amount.
When the thermal elongation deviation value exceeds a preset thermal elongation deviation threshold value, the laser calibrator in the existing equipment is used for calibrating the measuring equipment of the target spindle rotating tool, the calibrated measuring equipment is used for measuring the thermal elongation of the target spindle rotating tool, and the thermal elongation deviation value is used for indicating a parameter value of the degree of difference between the real-time thermal elongation and the thermal elongation deviation.
In the present application, the thermal elongation deviation threshold may be preset according to historical thermal elongation deviation data, and an average value of all the thermal elongation deviation values is used as the thermal elongation deviation threshold.
Additionally, in another aspect of the present application, in some embodiments, the present application provides a spindle rotary tool thermal elongation measurement apparatus, referring to fig. 4, which is a schematic diagram of exemplary hardware and/or software of a spindle rotary tool thermal elongation measurement apparatus according to some embodiments of the present application, the spindle rotary tool thermal elongation measurement apparatus 400 comprising: the acquisition module 401, the processing module 402, and the execution module 403 are respectively described as follows:
the acquisition module 401 is mainly used for starting the thermal elongation measurement of the main shaft rotating tool to acquire the historical temperature data and the historical thermal elongation measurement data of the target main shaft rotating tool;
The processing module 402 is used for determining a plurality of temperature control decision domains of the target spindle rotating tool according to the historical temperature data by the processing module 402;
In addition, the processing module 402 is further configured to determine a plurality of thermal hysteresis coefficients of the tool according to the historical thermal elongation measurement data, and convert all thermal hysteresis coefficients of the tool into a thermal hysteresis sequence;
In particular, the processing module 402 is further configured to determine a tool thermal sensitivity matrix according to the thermal hysteresis sequence and all temperature control decision domains, and further determine, according to the tool thermal sensitivity matrix, a thermal elongation approach amount of the target spindle rotating tool at the current moment, which is not traced again;
the execution module 403 is mainly used for carrying out measurement again after the measurement device of the target spindle rotating tool is calibrated through the thermal elongation approach amount.
In addition, the application also provides a computer device, which comprises a memory and a processor, wherein the memory stores codes, and the processor is configured to acquire the codes and execute the spindle rotation tool thermal elongation measuring method.
In some embodiments, reference is made to FIG. 5, which is a schematic structural diagram of a computer apparatus employing a spindle rotating tool thermal elongation measurement method according to some embodiments of the present application. The spindle rotation tool thermal elongation measurement method in the above embodiment may be implemented by a computer apparatus shown in fig. 5, the computer apparatus 500 including at least one processor 501, a communication bus 502, a memory 503, and at least one communication interface 504.
The processor 501 may be a general purpose central processing unit (central processing unit, CPU), application-specific integrated circuit (ASIC), or one or more of the methods for controlling the execution of the spindle rotary tool thermal elongation measurement methods of the present application.
Communication bus 502 may include a path to transfer information between the aforementioned components.
The Memory 503 may be, but is not limited to, a read-only Memory (ROM) or other type of static storage device that can store static information and instructions, a random access Memory (random access Memory, RAM) or other type of dynamic storage device that can store information and instructions, or an electrically erasable programmable read-only Memory (ELECTRICALLY ERASABLE PROGRAMMABLE READ-only Memory, EEPROM), a compact disc (compact disc read-only Memory) or other optical disk storage, optical disk storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory 503 may be separate and coupled to the processor 501 via a communication bus 502. Memory 503 may also be integrated with processor 501.
Wherein the memory 503 is for storing program codes for executing the inventive arrangements and is controlled for execution by the processor 501. The processor 501 is configured to execute program code stored in the memory 503. One or more software modules may be included in the program code. The determination of the amount of approach to thermal elongation in the above embodiments may be implemented by one or more software modules in program code in the processor 501 and memory 503.
Communication interface 504, using any transceiver-like device for communicating with other devices or communication networks, such as ethernet, radio access network (radio access network, RAN), wireless local area network (wireless local area networks, WLAN), etc.
In a specific implementation, as an embodiment, a computer device may include a plurality of processors, where each of the processors may be a single-core (single-CPU) processor or may be a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).
The computer device may be a general purpose computer device or a special purpose computer device. In a specific implementation, the computer device may be a desktop, a laptop, a web server, a personal computer (PDA), a mobile handset, a tablet, a wireless terminal device, a communication device, or an embedded device. Embodiments of the application are not limited to the type of computer device.
In addition, the application also provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program realizes the spindle rotation tool thermal elongation measuring method when being executed by a processor.
In summary, in the method and the device for measuring the thermal elongation of the spindle rotating tool disclosed by the embodiment of the application, a plurality of temperature control decision domains of a target spindle rotating tool are determined according to the historical temperature data, wherein the temperature control decision domains represent the influence degree of the environmental temperatures of different temperature measurement points of the spindle rotating tool on the thermal elongation of the spindle rotating tool; determining a thermal hysteresis sequence according to the historical thermal elongation measurement data, wherein the thermal hysteresis sequence can reflect the reaction speed of a key temperature measurement point to the thermal elongation under the influence of the ambient temperature; further, the thermal elongation of the main shaft rotating tool at the current moment is corrected through all temperature control decision domains and the thermal hysteresis sequences, and the corrected thermal elongation is used as the thermal elongation approaching amount of the main shaft rotating tool at the current moment; finally, the thermal elongation approaching amount is used for calibrating the measuring equipment of the main shaft rotating tool, and then the thermal elongation of the main shaft rotating tool is measured again, so that the influence of the environmental temperature on the thermal elongation change of the main shaft rotating tool is reduced.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. The method for measuring the thermal elongation of the spindle rotating cutter is characterized by comprising the following steps of:
Starting the thermal elongation measurement of the main shaft rotating tool to obtain historical temperature data and historical thermal elongation measurement data of the target main shaft rotating tool;
determining a plurality of temperature control decision domains of the target spindle rotating tool according to the historical temperature data;
determining a plurality of cutter thermal hysteresis coefficients according to the historical thermal elongation measurement data, and converting all the cutter thermal hysteresis coefficients into a thermal hysteresis sequence;
Determining a cutter heat sensitivity matrix by the thermal hysteresis sequence and all temperature control decision domains, and further determining the thermal elongation approaching amount of the target spindle rotating cutter at the current moment by the cutter heat sensitivity matrix;
and calibrating the measuring equipment of the target spindle rotating tool through the thermal elongation approach quantity, and then re-measuring.
2. The method of claim 1, wherein determining a plurality of temperature control decision domains for a target spindle rotating tool based on the historical temperature data comprises:
Determining each temperature control coupling degree of the spindle rotating tool according to the historical temperature data;
and determining a plurality of temperature control decision domains of the target spindle rotating tool through a preset temperature control decision value and all the temperature control coupling degrees.
3. The method of claim 2, wherein determining respective degrees of temperature controlled coupling of a spindle rotating tool based on the historical temperature data comprises:
Determining a plurality of temperature measurement dispersion sequences according to the historical temperature data;
And determining the respective temperature control coupling degree of the spindle rotating tool through all the temperature measurement dispersion sequences.
4. The method of claim 1, wherein determining a plurality of tool thermal hysteresis coefficients from the historical thermal elongation measurement data comprises:
Determining a tool thermal elongation mean square sequence according to the historical thermal elongation measurement data;
acquiring all temperature measurement dispersion sequences;
a plurality of tool thermal hysteresis coefficients are determined from all of the temperature measurement dispersion sequences and the tool thermal elongation mean square sequences.
5. The method of claim 1, wherein determining a tool thermal sensitivity matrix from the thermal hysteresis sequence and all temperature control decision domains comprises:
selecting a temperature control decision domain;
Determining a cutter heat sensitivity sequence of the temperature control decision domain according to the thermal hysteresis sequence;
repeating the steps to determine a cutter heat sensitivity sequence of the residual temperature control decision domain;
acquiring a thermal elongation mean square sequence of the cutter;
And forming a cutter heat-sensitive matrix by all the cutter heat-sensitive sequences and the cutter heat-extension mean square sequences.
6. The method of claim 1, wherein determining a thermal extension approach of a target spindle rotating tool at a current time by the tool thermal sensitivity matrix comprises:
Carrying out time-varying offset serialization on the cutter heat-sensitive matrix to obtain a cutter heat-sensitive time-varying characteristic sequence;
determining a cutter time-varying thermal response factor according to the cutter heat-varying time-varying characteristic sequence;
And determining the thermal extension approaching amount of the spindle rotating tool at the current moment through the thermal-sensitive time-varying characteristic sequence of the tool and the thermal-sensitive time-varying response factor of the tool.
7. The method of claim 6, wherein time-varying offset serializing the tool thermal sensitivity matrix to obtain a tool thermal-sensitive time-varying feature sequence comprises:
determining a time-varying offset time window sequence according to the cutter heat sensitivity matrix;
and determining a cutter thermosensitive time-varying characteristic sequence for the cutter thermosensitive matrix through the time-varying offset time window sequence.
8. The utility model provides a main shaft rotates cutter thermal extension measuring device which characterized in that includes:
the acquisition module is used for starting the thermal elongation measurement of the main shaft rotating tool and acquiring the historical temperature data and the historical thermal elongation measurement data of the target main shaft rotating tool;
The processing module is used for determining a plurality of temperature control decision domains of the target spindle rotating tool according to the historical temperature data;
The processing module is further used for determining a plurality of cutter thermal hysteresis coefficients according to the historical thermal elongation measurement data and converting all the cutter thermal hysteresis coefficients into a thermal hysteresis sequence;
The processing module is also used for determining a cutter heat sensitivity matrix according to the thermal hysteresis sequence and all temperature control decision domains, and further determining the thermal extension approaching amount of the target spindle rotating cutter at the current moment according to the cutter heat sensitivity matrix;
and the execution module is used for carrying out measurement again after calibrating the measurement equipment of the target spindle rotating tool through the thermal extension approach quantity.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, carries out the steps of the spindle rotation tool thermal elongation measurement method according to any one of claims 1 to 7.
10. A computer-readable storage medium storing a computer program, characterized in that the computer program, when executed by a processor, implements the steps of the spindle rotation tool thermal elongation measurement method according to any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410337202.9A CN117943893B (en) | 2024-03-22 | Method and device for measuring thermal elongation of main shaft rotating cutter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410337202.9A CN117943893B (en) | 2024-03-22 | Method and device for measuring thermal elongation of main shaft rotating cutter |
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| CN117943893A true CN117943893A (en) | 2024-04-30 |
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| JPH03503862A (en) * | 1987-10-20 | 1991-08-29 | アルベリッド，ビルガー | Cutting tools with status indicators |
| CN108490873A (en) * | 2018-02-28 | 2018-09-04 | 辽宁科技大学 | A kind of main shaft of numerical control machine tool thermal stretching prediction technique based on arest neighbors spatial point |
| CN111240268A (en) * | 2020-01-14 | 2020-06-05 | 重庆大学 | Axle system thermal error modeling method and thermal error compensation system based on SLSTM neural network |
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| DE3508143A1 (en) * | 1985-03-07 | 1986-09-11 | Franz Haimer | Two-coordinate length measuring device |
| JPH03503862A (en) * | 1987-10-20 | 1991-08-29 | アルベリッド，ビルガー | Cutting tools with status indicators |
| CN108490873A (en) * | 2018-02-28 | 2018-09-04 | 辽宁科技大学 | A kind of main shaft of numerical control machine tool thermal stretching prediction technique based on arest neighbors spatial point |
| CN111240268A (en) * | 2020-01-14 | 2020-06-05 | 重庆大学 | Axle system thermal error modeling method and thermal error compensation system based on SLSTM neural network |
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